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Shumyantseva VV, Bulko TV, Chistov AA, Kolesanova EF, Agafonova LE. Pharmacogenomic Studies of Antiviral Drug Favipiravir. Pharmaceutics 2024; 16:503. [PMID: 38675164 PMCID: PMC11053860 DOI: 10.3390/pharmaceutics16040503] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2024] [Revised: 03/22/2024] [Accepted: 04/01/2024] [Indexed: 04/28/2024] Open
Abstract
In this work, we conducted a study of the interaction between DNA and favipiravir (FAV). This chemotherapeutic compound is an antiviral drug for the treatment of COVID-19 and other infections caused by RNA viruses. This paper examines the electroanalytical characteristics of FAV. The determined concentrations correspond to therapeutically significant ones in the range of 50-500 µM (R2 = 0.943). We have shown that FAV can be electro-oxidized around the potential of +0.96 V ÷ +0.98 V (vs. Ag/AgCl). A mechanism for electrochemical oxidation of FAV was proposed. The effect of the drug on DNA was recorded as changes in the intensity of electrochemical oxidation of heterocyclic nucleobases (guanine, adenine and thymine) using screen-printed graphite electrodes modified with single-walled carbon nanotubes and titanium oxide nanoparticles. In this work, the binding constants (Kb) of FAV/dsDNA complexes for guanine, adenine and thymine were calculated. The values of the DNA-mediated electrochemical decline coefficient were calculated as the ratio of the intensity of signals for the electrochemical oxidation of guanine, adenine and thymine in the presence of FAV to the intensity of signals for the electro-oxidation of these bases without drug (S, %). Based on the analysis of electrochemical parameters, values of binding constants and spectral data, intercalation was proposed as the principal mechanism of the antiviral drug FAV interaction with DNA. The interaction with calf thymus DNA also confirmed the intercalation mechanism. However, an additional mode of interaction, such as a damage effect together with electrostatic interactions, was revealed in a prolonged exposure of DNA to FAV.
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Affiliation(s)
- Victoria V. Shumyantseva
- Institute of Biomedical Chemistry, Pogodinskaya Street, 10, Build 8, Moscow 119121, Russia; (T.V.B.); (A.A.C.); (E.F.K.); (L.E.A.)
- Department of Biochemistry, Pirogov Russian National Research Medical University, Ostrovitianov Street, 1, Moscow 117997, Russia
| | - Tatiana V. Bulko
- Institute of Biomedical Chemistry, Pogodinskaya Street, 10, Build 8, Moscow 119121, Russia; (T.V.B.); (A.A.C.); (E.F.K.); (L.E.A.)
| | - Alexey A. Chistov
- Institute of Biomedical Chemistry, Pogodinskaya Street, 10, Build 8, Moscow 119121, Russia; (T.V.B.); (A.A.C.); (E.F.K.); (L.E.A.)
| | - Ekaterina F. Kolesanova
- Institute of Biomedical Chemistry, Pogodinskaya Street, 10, Build 8, Moscow 119121, Russia; (T.V.B.); (A.A.C.); (E.F.K.); (L.E.A.)
| | - Lyubov E. Agafonova
- Institute of Biomedical Chemistry, Pogodinskaya Street, 10, Build 8, Moscow 119121, Russia; (T.V.B.); (A.A.C.); (E.F.K.); (L.E.A.)
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Zhdanov DD, Ivin YY, Shishparenok AN, Kraevskiy SV, Kanashenko SL, Agafonova LE, Shumyantseva VV, Gnedenko OV, Pinyaeva AN, Kovpak AA, Ishmukhametov AA, Archakov AI. Perspectives for the creation of a new type of vaccine preparations based on pseudovirus particles using polio vaccine as an example. BIOMEDITSINSKAIA KHIMIIA 2023; 69:253-280. [PMID: 37937429 DOI: 10.18097/pbmc20236905253] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2023]
Abstract
Traditional antiviral vaccines are currently created by inactivating the virus chemically, most often using formaldehyde or β-propiolactone. These approaches are not optimal since they negatively affect the safety of the antigenic determinants of the inactivated particles and require additional purification stages. The most promising platforms for creating vaccines are based on pseudoviruses, i.e., viruses that have completely preserved the outer shell (capsid), while losing the ability to reproduce owing to the destruction of the genome. The irradiation of viruses with electron beam is the optimal way to create pseudoviral particles. In this review, with the example of the poliovirus, the main algorithms that can be applied to characterize pseudoviral particles functionally and structurally in the process of creating a vaccine preparation are presented. These algorithms are, namely, the analysis of the degree of genome destruction and coimmunogenicity. The structure of the poliovirus and methods of its inactivation are considered. Methods for assessing residual infectivity and immunogenicity are proposed for the functional characterization of pseudoviruses. Genome integrity analysis approaches, atomic force and electron microscopy, surface plasmon resonance, and bioelectrochemical methods are crucial to structural characterization of the pseudovirus particles.
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Affiliation(s)
- D D Zhdanov
- Institute of Biomedical Chemistry, Moscow, Russia
| | - Yu Yu Ivin
- Institute of Biomedical Chemistry, Moscow, Russia; Chumakov Federal Scientific Center for Research and Development of Immune-and-Biological Products of Russian Academy of Sciences, Moscow, Russia
| | | | | | | | | | - V V Shumyantseva
- Institute of Biomedical Chemistry, Moscow, Russia; Pirogov Russian National Research Medical University, Moscow, Russia
| | - O V Gnedenko
- Institute of Biomedical Chemistry, Moscow, Russia
| | - A N Pinyaeva
- Institute of Biomedical Chemistry, Moscow, Russia; Chumakov Federal Scientific Center for Research and Development of Immune-and-Biological Products of Russian Academy of Sciences, Moscow, Russia
| | - A A Kovpak
- Institute of Biomedical Chemistry, Moscow, Russia
| | - A A Ishmukhametov
- Chumakov Federal Scientific Center for Research and Development of Immune-and-Biological Products of Russian Academy of Sciences, Moscow, Russia
| | - A I Archakov
- Institute of Biomedical Chemistry, Moscow, Russia; Pirogov Russian National Research Medical University, Moscow, Russia
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Filippova TA, Masamrekh RA, Shumyantseva VV, Latsis IA, Farafonova TE, Ilina IY, Kanashenko SL, Moshkovskii SA, Kuzikov AV. Electrochemical biosensor for trypsin activity assay based on cleavage of immobilized tyrosine-containing peptide. Talanta 2023; 257:124341. [PMID: 36821964 DOI: 10.1016/j.talanta.2023.124341] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2022] [Revised: 01/13/2023] [Accepted: 02/09/2023] [Indexed: 02/16/2023]
Abstract
In this work, we proposed a biosensor for trypsin proteolytic activity assay using immobilization of model peptides on screen-printed electrodes (SPE) modified with gold nanoparticles (AuNPs) prepared by electrosynthetic method. Sensing of proteolytic activity was based on electrochemical oxidation of tyrosine residues of peptides. We designed peptides containing N-terminal cysteine residue for immobilization on an SPE, modified with gold nanoparticles, trypsin-specific cleavage site and tyrosine residue as a redox label. The peptides were immobilized on SPE by formation of chemical bonds between mercapto groups of the N-terminal cysteine residues and AuNPs. After the incubation with trypsin, time-dependent cleavage of the immobilized peptides was observed by decline in tyrosine electrochemical oxidation signal. The kinetic parameters of trypsin, such as the catalytic constant (kcat), the Michaelis constant (KM) and the catalytic efficiency (kcat/KM), toward the CGGGRYR peptide were determined as 0.33 ± 0.01 min-1, 198 ± 24 nM and 0.0016 min-1 nM-1, respectively. Using the developed biosensor, we demonstrated the possibility of analysis of trypsin specificity toward the peptides with amino acid residues disrupting proteolysis. Further, we designed the peptides with proline or glutamic acid residues after the cleavage site (CGGRPYR and CGGREYR), and trypsin had reduced activity toward both of them according to the existing knowledge of the enzyme specificity. The developed biosensor system allows one to perform a comparative analysis of the protease steady-state kinetic parameters and specificity toward model peptides with different amino acid sequences.
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Affiliation(s)
- Tatiana A Filippova
- Pirogov Russian National Research Medical University, 1 Ostrovityanova st., Moscow 117997, Russia; Institute of Biomedical Chemistry, 10, Pogodinskaya st., Moscow, 119121, Russia
| | - Rami A Masamrekh
- Pirogov Russian National Research Medical University, 1 Ostrovityanova st., Moscow 117997, Russia; Institute of Biomedical Chemistry, 10, Pogodinskaya st., Moscow, 119121, Russia
| | - Victoria V Shumyantseva
- Pirogov Russian National Research Medical University, 1 Ostrovityanova st., Moscow 117997, Russia; Institute of Biomedical Chemistry, 10, Pogodinskaya st., Moscow, 119121, Russia
| | - Ivan A Latsis
- Federal Research and Clinical Center of Physical-Chemical Medicine, 1a Malaya Pirogovskaya st., Moscow, 119435, Russia
| | | | - Irina Y Ilina
- Federal Research and Clinical Center of Physical-Chemical Medicine, 1a Malaya Pirogovskaya st., Moscow, 119435, Russia
| | - Sergey L Kanashenko
- Institute of Biomedical Chemistry, 10, Pogodinskaya st., Moscow, 119121, Russia
| | - Sergei A Moshkovskii
- Pirogov Russian National Research Medical University, 1 Ostrovityanova st., Moscow 117997, Russia; Federal Research and Clinical Center of Physical-Chemical Medicine, 1a Malaya Pirogovskaya st., Moscow, 119435, Russia.
| | - Alexey V Kuzikov
- Pirogov Russian National Research Medical University, 1 Ostrovityanova st., Moscow 117997, Russia; Institute of Biomedical Chemistry, 10, Pogodinskaya st., Moscow, 119121, Russia.
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Imanzadeh H, Sefid-Sefidehkhan Y, Afshary H, Afruz A, Amiri M. Nanomaterial-based electrochemical sensors for detection of amino acids. J Pharm Biomed Anal 2023; 230:115390. [PMID: 37079932 DOI: 10.1016/j.jpba.2023.115390] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2022] [Revised: 03/24/2023] [Accepted: 04/08/2023] [Indexed: 04/22/2023]
Abstract
Amino acids are the building blocks of proteins and muscle tissue. They also play a significant role in physiological processes related to energy, recovery, mood, muscle and brain function, fat burning and stimulating growth hormone or insulin secretion. Accurate determination of amino acids in biological fluids is necessary because any changes in their normal ranges in the body warn diseases like kidney disease, liver disease, type 2 diabetes and cancer. To date, many methods such as liquid chromatography, fluorescence mass spectrometry, etc. have been used for the determination of amino acids. Compared with the above techniques, electrochemical systems using modified electrodes offer a rapid, accurate, cheap, real-time analytical path through simple operations with high selectivity and sensitivity. Nanomaterials have found many interests to create smart electrochemical sensors in different application fields e.g. biomedical, environmental, and food analysis because of their exceptional properties. This review summarizes recent advances in the development of nanomaterial-based electrochemical sensors in 2017-2022 for the detection of amino acids in various matrices such as serum, urine, blood and pharmaceuticals.
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Affiliation(s)
- Hamideh Imanzadeh
- Department of Chemistry, University of Mohaghegh Ardabili, Ardabil, Iran
| | | | - Hosein Afshary
- Department of Chemistry, University of Mohaghegh Ardabili, Ardabil, Iran
| | - Ali Afruz
- Department of Chemistry, University of Mohaghegh Ardabili, Ardabil, Iran
| | - Mandana Amiri
- Department of Chemistry, University of Mohaghegh Ardabili, Ardabil, Iran.
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Moro G, Campos R, Daems E, Maria Moretto L, De Wael K. Haem-Mediated Albumin Biosensing: Towards Voltammetric Detection of PFOA. Bioelectrochemistry 2023; 152:108428. [PMID: 37004377 DOI: 10.1016/j.bioelechem.2023.108428] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Revised: 03/20/2023] [Accepted: 03/22/2023] [Indexed: 03/29/2023]
Abstract
The haem group is a promising redox probe for the design of albumin-based voltammetric sensors. Among the endogenous ligands carried by human serum albumin (hSA), haem is characterised by a reversible redox behaviour and its binding kinetics strongly depend on hSA's conformation, which, in turn, depends on the presence of other ligands. In this work, the potential applicability of haem, especially hemin, as a redox probe was first tested in a proof-of-concept study using perfluorooctanoic acid (PFOA) as model analyte. PFOA is known to bind hSA by occupying Sudlow's I site (FA7) which is spatially related to the haem-binding site (FA1). The latter undergoes a conformational change, which is expected to affect hemin's binding kinetics. To verify this hypothesis, hemin:albumin complexes in the presence/absence of PFOA were first screened by UV-Vis spectroscopy. Once the complex formation was verified, haem was further characterised via electrochemical methods to estimate its electron transfer kinetics. The hemin:albumin:PFOA system was studied in solution, with the aim of describing the multiple equilibria at stake and designing an electrochemical assay for PFOA monitoring. This latter could be integrated with protein-based bioremediation approaches for the treatment of per- and polyfluoroalkyl substances polluted waters. Overall, our preliminary results show how hemin can be applied as a redox probe in albumin-based voltammetric sensing strategies.
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Agafonova L, Zhdanov D, Gladilina Y, Kanashenko S, Shumyantseva V. A pilot study on an electrochemical approach for assessing transient DNA transfection in eukaryotic cells. J Electroanal Chem (Lausanne) 2022. [DOI: 10.1016/j.jelechem.2022.116635] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Electroenzymatic Model System for the Determination of Catalytic Activity of Erwinia carotovora L-Asparaginase. Processes (Basel) 2022. [DOI: 10.3390/pr10071313] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
An electrochemical method for the determination of the catalytic activity of L-asparaginase (ASNase) from Erwinia carotovora was proposed. Our approach is based on the electrooxidation of amino acids from L-asparaginase polypeptide backbones. The electrochemical behavior of ASNase on electrodes obtained by screen-printing modified with single-wall carbon nanotubes (SPE/SWCNTs) as sensing elements demonstrated a broad oxidation peak at 0.5–0.6 V centered at 0.531 ± 0.010 V. We have shown that in the presence of the substrate L-asparagine, the oxidation current of the enzyme was reduced in a concentration-dependent manner. The specificity of electrochemical analysis was confirmed in experiments with glycine, an amino acid with no substrate activity on ASNase and does not reduce the oxidation peak of L-asparaginase. The addition of glycine did not significantly influence the amplitude of the oxidation current. The innovative aspects of the proposed electrochemical sensor are the direct monitoring of ASNase catalytic activity and a reagentless approach, which does not require additional reagents or labels.
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Moulaee K, Neri G. Electrochemical Amino Acid Sensing: A Review on Challenges and Achievements. BIOSENSORS 2021; 11:502. [PMID: 34940259 PMCID: PMC8699811 DOI: 10.3390/bios11120502] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Revised: 11/18/2021] [Accepted: 11/25/2021] [Indexed: 05/05/2023]
Abstract
The rapid growth of research in electrochemistry in the last decade has resulted in a significant advancement in exploiting electrochemical strategies for assessing biological substances. Among these, amino acids are of utmost interest due to their key role in human health. Indeed, an unbalanced amino acid level is the origin of several metabolic and genetic diseases, which has led to a great need for effective and reliable evaluation methods. This review is an effort to summarize and present both challenges and achievements in electrochemical amino acid sensing from the last decade (from 2010 onwards) to show where limitations and advantages stem from. In this review, we place special emphasis on five well-known electroactive amino acids, namely cysteine, tyrosine, tryptophan, methionine and histidine. The recent research and achievements in this area and significant performance metrics of the proposed electrochemical sensors, including the limit of detection, sensitivity, stability, linear dynamic range(s) and applicability in real sample analysis, are summarized and presented in separate sections. More than 400 recent scientific studies were included in this review to portray a rich set of ideas and exemplify the capabilities of the electrochemical strategies to detect these essential biomolecules at trace and even ultra-trace levels. Finally, we discuss, in the last section, the remaining issues and the opportunities to push the boundaries of our knowledge in amino acid electrochemistry even further.
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Affiliation(s)
- Kaveh Moulaee
- Department of Engineering, University of Messina, C.Da Di Dio, I-98166 Messina, Italy;
- Center of Excellence in Electrochemistry, School of Chemistry, College of Science, University of Tehran, Tehran 16846-13114, Iran
| | - Giovanni Neri
- Department of Engineering, University of Messina, C.Da Di Dio, I-98166 Messina, Italy;
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Fatemeh Shayanfar, Hamid Sarhadi. Determination of Vitamin C at Modified Screen Printed Electrode: Application for Sensing of Vitamin C in Real Samples. SURFACE ENGINEERING AND APPLIED ELECTROCHEMISTRY 2021. [DOI: 10.3103/s1068375521040141] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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10
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Murtada K, Salghi R, Ríos A, Zougagh M. A sensitive electrochemical sensor based on aluminium doped copper selenide nanoparticles-modified screen printed carbon electrode for determination of L-tyrosine in pharmaceutical samples. J Electroanal Chem (Lausanne) 2020. [DOI: 10.1016/j.jelechem.2020.114466] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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Ren Y, Ji J, Sun J, Pi F, Zhang Y, Sun X. Rapid detection of antibiotic resistance in Salmonella with screen printed carbon electrodes. J Solid State Electrochem 2020. [DOI: 10.1007/s10008-020-04645-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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Zhu Q, Liu C, Zhou L, Wu L, Bian K, Zeng J, Wang J, Feng Z, Yin Y, Cao Z. Highly sensitive determination of L-tyrosine in pig serum based on ultrathin CuS nanosheets composite electrode. Biosens Bioelectron 2019; 140:111356. [PMID: 31163395 DOI: 10.1016/j.bios.2019.111356] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2019] [Revised: 05/23/2019] [Accepted: 05/26/2019] [Indexed: 01/02/2023]
Abstract
Nanometer-sized copper sulfide has remarkable properties such as metal like electrical conductivity and electrocatalytic activity. In this work, ultrathin copper sulfide nanosheets (CuS NS) were synthesized and employed to modify on surface of glassy carbon electrode (GCE) combining with chitosan (CS) and acidified multi-walled carbon nanotubes (F-MWCNTs). Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) showed that the shape of CuS NS was hexagon with side length of 13.33 ± 0.67 nm and thickness of 4.50 ± 0.58 nm. The electrochemical characteristics of different nanocomposite modified electrodes were examined by using cyclic voltammetry (CV) and differential pulse voltammetry (DPV), indicating that the modified electrode of CuS NS-CS/F-MWCNTs/GCE possessed good electrocatalytic activity towards oxidation of L-tyrosine (L-Tyr). Under the optimal condition, the modified electrode exhibited a wide linear response range for L-Tyr (0.08-1.0 μM) with a detection limit of 4.9 nM. No obvious interferences from coexisted two-fold of L-tryptophan and 50-fold of other amino acids could be observed, indicating its relatively good selectivity. The electrode also had good repeatability, reproducibility and stability. Compared with a commercial instrument analytical method, HPLC, the electrode can be successfully applied to the determination of L-Tyr in pig serums with a recovery rate of 95.7%-102.6%, and its test results are in good agreement with that of HPLC, showing its promising application value.
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Affiliation(s)
- Qin Zhu
- Collaborative Innovation Center of Micro/nano Bio-sensing and Food Safety Inspection, Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation, School of Chemistry and Biological Engineering, Changsha University of Science and Technology, Changsha, 410114, PR China
| | - Chu Liu
- Collaborative Innovation Center of Micro/nano Bio-sensing and Food Safety Inspection, Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation, School of Chemistry and Biological Engineering, Changsha University of Science and Technology, Changsha, 410114, PR China
| | - Li Zhou
- Collaborative Innovation Center of Micro/nano Bio-sensing and Food Safety Inspection, Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation, School of Chemistry and Biological Engineering, Changsha University of Science and Technology, Changsha, 410114, PR China
| | - Ling Wu
- Collaborative Innovation Center of Micro/nano Bio-sensing and Food Safety Inspection, Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation, School of Chemistry and Biological Engineering, Changsha University of Science and Technology, Changsha, 410114, PR China; College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, PR China
| | - Kejun Bian
- Collaborative Innovation Center of Micro/nano Bio-sensing and Food Safety Inspection, Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation, School of Chemistry and Biological Engineering, Changsha University of Science and Technology, Changsha, 410114, PR China
| | - Julan Zeng
- Collaborative Innovation Center of Micro/nano Bio-sensing and Food Safety Inspection, Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation, School of Chemistry and Biological Engineering, Changsha University of Science and Technology, Changsha, 410114, PR China
| | - Jianxiu Wang
- College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, PR China
| | - Zemeng Feng
- Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha, 410125, PR China
| | - Yulong Yin
- Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha, 410125, PR China
| | - Zhong Cao
- Collaborative Innovation Center of Micro/nano Bio-sensing and Food Safety Inspection, Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation, School of Chemistry and Biological Engineering, Changsha University of Science and Technology, Changsha, 410114, PR China.
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Huang X, Wei S, Yao S, Zhang H, He C, Cao J. Development of molecularly imprinted electrochemical sensor with reduced graphene oxide and titanium dioxide enhanced performance for the detection of toltrazuril in chicken muscle and egg. J Pharm Biomed Anal 2018; 164:607-614. [PMID: 30469110 DOI: 10.1016/j.jpba.2018.11.020] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2018] [Revised: 11/06/2018] [Accepted: 11/08/2018] [Indexed: 11/29/2022]
Abstract
A molecularly imprinted electrochemical sensor for toltrazuril (TZR) detection based on molecularly imprinted polymers (MIPs) immobilized on reduced graphene oxide (rGO) and titanium dioxide (TiO2) modified platinum (Pt) electrode surface was fabricated for the first time. The synergistic fast electron transfer ability, large electroactive surface area and high catalytic activity from rGO and TiO2 contribute to amplify the electrochemical signal and consequently improve the sensitivity of the sensor. The cyclic voltammetry (CV), differential pulse voltammetry (DPV) and electrochemical impedance spectroscopy (EIS) tests were used to evaluate the performance of the electrochemical sensor. The results showed that the electrochemical sensor possessed high sensitivity, good selectivity and anti-interference ability toward TZR. By using the DPV, the electrochemical sensor displayed a wide linear concentration range from 0.43 to 42.54 μg/L, with a limit of detection of 0.21 μg/L (S/N = 3). Moreover, the recoveries and relative standard deviations (RSD) were 85.0%-97.0% and 3.5%-6.4% at three concentration levels, respectively, implying that the established sensor is promising for the accurate detection of TZR at trace levels in chicken muscle and egg samples.
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Affiliation(s)
- Xiangjin Huang
- Zhaoqing Institute for Food Control, Zhaoqing, 526060, China
| | - Shoulian Wei
- College of Environmental and Chemical Engineering, Zhaoqing University, Zhaoqing, 526061, China.
| | - Su Yao
- School of Food & Pharmaceutical Engineering, Zhaoqing University, Zhaoqing, 526061, China
| | - Huasheng Zhang
- Zhaoqing Institute for Food Control, Zhaoqing, 526060, China
| | - Chunlin He
- Zhaoqing Institute for Food Control, Zhaoqing, 526060, China
| | - Jiangfei Cao
- College of Environmental and Chemical Engineering, Zhaoqing University, Zhaoqing, 526061, China
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